/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.dboe.transaction;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.apache.jena.atlas.lib.Pair;
import org.apache.jena.dboe.base.file.Location;
import org.apache.jena.dboe.transaction.txn.TransactionCoordinator;
import org.apache.jena.system.Txn;

/** Unusual ways to do things.
 *  Rather than a TransactionalComponent,
 *  TransactionalInteger
 */
public class TestTxnLib2 {
    // With setup/teardown / not from AbstractTestTxn
    private final long InitValue = 7;
    TransactionalInteger integer;

    @BeforeEach public void setup() {
        TransactionCoordinator coord = TransactionCoordinator.create(Location.mem());
        integer = new TransactionalInteger(coord, InitValue);
        coord.start();
    }

    @AfterEach public void clearup() {
        integer.shutdown();
    }

    @Test public void libTxn_10() {
        Txn.executeWrite(integer, integer::inc);
        long x = Txn.calculateRead(integer, integer::get);
        assertEquals(InitValue+1, x);
    }

    @Test public void libTxn_11() {
        Pair<Long, Long> p = Txn.calculateWrite(integer, () -> {
            integer.inc();
            return Pair.create(integer.value(), integer.get());
        });
        assertEquals(InitValue,     p.getLeft().longValue());
        assertEquals(InitValue+1,   p.getRight().longValue());
        assertEquals(InitValue+1,   integer.get());
        assertEquals(InitValue+1,   integer.value());
    }
}

